There seems no reason for this.

It would have been impossible for him, had he at that time been entrusted with the government of the State, entirely to put into practice what he had said from his place in the Chamber.

But he was not minister; he was only a party leader; his speeches were, as they were intended to be, party speeches; they had something of the exaggeration which conflict always produces.

They were, moreover, opposition speeches, for he was addressing not so much the Government as the Chamber and the country, and in them the party to which he belonged was a very small minority.
But why was there not to be a Conservative party in Prussia?
It was necessary for the proper development of constitutional life that the dominant Liberal doctrines should be opposed by this bold criticism.
Bismarck was only doing what in England was done by the young Disraeli, by Carlyle, and by Ruskin; the world would not be saved by constitutional formulae.
There were some of his party whose aims went indeed beyond what may be considered morally legitimate and politically practicable.

The Gerlachs and many of their friends, and the purely military party which was headed by Prince Charles Frederick, the King's youngest brother, desired to do away with the Constitution, to dismiss the Parliament, and to restore the absolute monarchy in a form which would have been more extreme than that which it had had since 1815.